* Added OPENING & CLOSING State Support
Added support for OPENING and CLOSING states using a combination of
the required V_ variables. Simplified the determination of the
cover's state by use of a new enumeration and single method allowing
the state to be used by all three HomeAssistant query methods.
* Fixes for HomeAssistant Style
Corrections to style to allow flake8, isort, and black to pass.
* Peer Review Changes
Added @unique to the main enumeration. Removed unnecessary parens from
door state logic. Reordered CLOSING and CLOSED in the enumeration.
